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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e62600608f227bf33695049c9a011752bdf150af2d371c88931df7f69e86a80' 
  AND token = 'a4y5vulAMIACNAYQDU1QhON7Zaxka9QmYctqxC0EVo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}